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Set of isoelectronic species is

1. N2, CO2, CN−, O2
2. N, H2S, CO
3. N2, CO, CN−, O2+
4. Ca, Mg, Cl

Correct answer: N2, CO, CN−, O2+

Solution

Isoelectronic species have the same number of electrons. N2, CO, CN−, and O2+ all have 14 electrons, making them isoelectronic.

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